package com.shengyin.ec.controller.common;

import java.awt.image.BufferedImage;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RequestMapping;

import com.google.code.kaptcha.Constants;
import com.google.code.kaptcha.Producer;
import com.shengyin.ec.exception.ControllerException;

@Controller  
@RequestMapping("/")  
public class CaptchaImageCreateController {  
    
  private Producer captchaProducer = null;  
 
  @Autowired  
   public void setCaptchaProducer(Producer captchaProducer) {  
      this.captchaProducer = captchaProducer;  
  }  
 
  @RequestMapping("/captcha-image")  
 public String handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {  

      response.setDateHeader("Expires", 0);  
      // Set standard HTTP/1.1 no-cache headers.  
      response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");  
       // Set IE extended HTTP/1.1 no-cache headers (use addHeader).  
     response.addHeader("Cache-Control", "post-check=0, pre-check=0");  
    // Set standard HTTP/1.0 no-cache header.  
     response.setHeader("Pragma", "no-cache");  
      // return a jpeg  
       response.setContentType("image/jpeg");  
       // create the text for the image  
      String capText = captchaProducer.createText();  
       // store the text in the session  
    request.getSession().setAttribute(Constants.KAPTCHA_SESSION_KEY, capText);  
      // create the image with the text  
       BufferedImage bi = captchaProducer.createImage(capText);  
       ServletOutputStream out = response.getOutputStream();  
      // write the data out  
      ImageIO.write(bi, "jpg", out);  
       try {  
          out.flush();  
       } finally {  
           out.close();  
      }  
      return null;  
  }  
  /*
   * spring mvc异常处理方法，在controller发生异常，可以以抛出ControllerException，以供捕获
   * */
  @ExceptionHandler({ControllerException.class})  
	   public String exception(ControllerException e,HttpServletRequest request) {  
	       request.setAttribute("error", e.getMessage());
	        return "/admin/error/error";  
	    }  
}  
